From 912723e7e23602816e91bd938737a5c50d4b43b1 Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Wed, 27 May 2020 12:33:23 +0100
Subject: [PATCH] Fix for slowdown if a file URL refers to a missing drive.
 Might be a windows-only thing.

---
 resources/images/blank-1x1.png      | Bin 0 -> 67 bytes
 src/calibre/gui2/comments_editor.py |   4 ++--
 src/calibre/gui2/widgets2.py        |  14 +++++++++++++-
 3 files changed, 15 insertions(+), 3 deletions(-)
 create mode 100644 resources/images/blank-1x1.png

diff --git a/resources/images/blank-1x1.png b/resources/images/blank-1x1.png
new file mode 100644
index 0000000000000000000000000000000000000000..91a99b94e23a00cc8133f22e3fe2a0b48a015808
GIT binary patch
literal 67
zcmeAS@N?(olHy`uVBq!ia0vp^j3CUx1|;Q0k8}blE>9Q7kcv6UAQ@H$MqV!6EkIEQ
MPgg&ebxsLQ07X&@0{{R3

literal 0
HcmV?d00001

diff --git a/src/calibre/gui2/comments_editor.py b/src/calibre/gui2/comments_editor.py
index c1a2f48881..34db3b65a4 100644
--- a/src/calibre/gui2/comments_editor.py
+++ b/src/calibre/gui2/comments_editor.py
@@ -28,7 +28,7 @@ from calibre.gui2.widgets import LineEditECM
 from calibre.gui2.widgets2 import to_plain_text
 from calibre.utils.config import tweaks
 from calibre.utils.imghdr import what
-from polyglot.builtins import filter, iteritems, itervalues, unicode_type
+from polyglot.builtins import filter, iteritems, itervalues, unicode_type, as_bytes
 
 # Cleanup Qt markup {{{
 
@@ -764,7 +764,7 @@ class EditorWidget(QTextEdit, LineEditECM):  # {{{
                     with lopen(path, 'rb') as f:
                         data = f.read()
                 except EnvironmentError:
-                    pass
+                    return QByteArray(I('blank-1x1.png', data=True))
                 else:
                     return QByteArray(data)
 
diff --git a/src/calibre/gui2/widgets2.py b/src/calibre/gui2/widgets2.py
index 97f2d60e73..5aa6c9df59 100644
--- a/src/calibre/gui2/widgets2.py
+++ b/src/calibre/gui2/widgets2.py
@@ -11,7 +11,7 @@ from PyQt5.Qt import (
     QDialogButtonBox, QFont, QFontInfo, QFontMetrics, QIcon, QKeySequence, QLabel,
     QLayout, QPalette, QPixmap, QPoint, QPushButton, QRect, QScrollArea, QSize,
     QSizePolicy, QStyle, QStyledItemDelegate, Qt, QTabWidget, QTextBrowser,
-    QToolButton, QUndoCommand, QUndoStack, QWidget, pyqtSignal
+    QToolButton, QUndoCommand, QUndoStack, QWidget, pyqtSignal, QByteArray
 )
 
 from calibre.ebooks.metadata import rating_to_stars
@@ -482,6 +482,18 @@ class HTMLDisplay(QTextBrowser):
                 return
         self.anchor_clicked.emit(qurl)
 
+    def loadResource(self, rtype, qurl):
+        if qurl.isLocalFile():
+            path = qurl.toLocalFile()
+            try:
+                with lopen(path, 'rb') as f:
+                    data = f.read()
+            except EnvironmentError:
+                return QByteArray(I('blank-1x1.png', data=True))
+            else:
+                return QByteArray(data)
+        else:
+            QTextBrowser.loadResource(self, rtype, qurl)
 
 class ScrollingTabWidget(QTabWidget):